为了使模块尽可能独立，要求模块的内聚程度要尽量高，且各模块间的耦合程度要尽量 【3】 。
参考答案：弱
— Wow! It snowed last night. What a nice world!
— You're right. But it's more difficult to find my missing keys with snow________ the ground.[ ]
A. covered
B. cover
C. to cover
D. covering
32厘米是______米，用小数表示是______米．
